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I am working with timezones in a Java application using JodaTime. I encounter a problem when trying to build a DateTimeZone (JodaTime) object from the id of a java timezone. Joda throws a
java.lang.IllegalArgumentException: The datetime zone id 'SystemV/HST10' is not recognised
for the folowing list of timezones:
What are these timezones used for? Are they relevant to non-programmers? Should an application designed for general uses support these timezones?
Thanks.
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As Jon Skeet already said, java.util.Date does not have a time zone. A Date object represents a number of milliseconds since January 1, 1970, 12:00 AM, UTC. It does not contain time zone information.
Time zone data is provided by the public IANA time zone database. The following table shows all the time zones supported by Joda-Time, using version 2018g of the database. It is also possible to update to a later version of the database.
Note that from Java SE 8 onwards, users are asked to migrate to java.time (JSR-310) - a core part of the JDK which replaces this project. Solution using java.time, the modern Date-Time API: If you want to get just date and time (and not the timezone information), you can use LocalDateTime.#now (ZoneId).
In Java 8 you'd use java.time.ZonedDateTime, which is the Java 8 equivalent of Joda Time's DateTime. @user3132194: And what benefit do you think that will have over new Date ()? It is just a template for copy-paste, based on your answer. You said that Date is always UTC-based. I need local time.
The SystemV time-zone IDs are old and deprecated. However, you can make Joda-Time understand them by re-compiling the joda-time jar file with the systemv time-zone data file included. See the commented out lines in the systemv data file. (ie. uncomment the lines and rebuild the jar file).
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